/*
 * Property.java
 *
 * Copyright (C) 2002-2006 Alexei Drummond and Andrew Rambaut
 *
 * This file is part of BEAST.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership and licensing.
 *
 * BEAST is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 *  BEAST is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with BEAST; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

package dr.util;

import java.lang.reflect.Method;


/**
 * Gets a property of another object using introspection.
 *
 * @version $Id: Property.java,v 1.19 2005/05/24 20:26:01 rambaut Exp $
 *
 * @author Andrew Rambaut
 * @author Alexei Drummond
 */
public class Property implements Attribute {
	
	private Object object = null;
	private Method getter = null;
	private Object argument = null;
	private String name = null;
	
	public Property(Object object, String name) {
		this(object, name, null);
	}
	
	public Property(Object object, String name, Object argument) {
	
		this.name = name;
		this.argument = argument;
			
		this.object = object;
		
		StringBuffer getterName = new StringBuffer("get");
		getterName.append(name.substring(0, 1).toUpperCase());
		getterName.append(name.substring(1));
		Class c = object.getClass();
		
		//System.out.println(getterName + "(" + argument + ")");
		
		try {
			if (argument != null)
				getter = c.getMethod(getterName.toString(), new Class[] {argument.getClass()});
			else
				getter = c.getMethod(getterName.toString(), (Class [])null);
		} catch (NoSuchMethodException e) { }
		
	}

	public Method getGetter() { return getter; }
	
	//public Object getObject() { return object; }
	
	public String getAttributeName() {
		if (argument == null) return name;
		return name + "." + argument;
	}
	
	public Object getAttributeValue() {
		if (object == null || getter == null)
			return null;
			
		Object result = null;
		Object[] args = null;
		if (argument != null)
			args = new Object[] { argument };
			 
		try {
			result = getter.invoke(object, args);
		} catch (Exception e) { 
			
			e.printStackTrace(System.out);
		
			throw new RuntimeException(e.getMessage());
		}					
			
		return result;
	}
	
	public String getPropertyName() { return name; }
	
	public String toString() { 
		return getAttributeValue().toString(); 
	}
}
